mc68hc908bd48 Freescale Semiconductor, Inc, mc68hc908bd48 Datasheet - Page 193

• Manufacturer Part Number: mc68hc908bd48
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

15.1 Contents
15.2 Introduction
MC68HC908BD48
Freescale Semiconductor
Data Sheet — MC68HC908BD48
—
Rev. 2.1
15.2
15.3
15.4
15.5
15.6
15.6.1
15.6.2
15.6.3
15.6.4
15.6.5
15.6.6
15.6.7
15.7
This DDC12AB Interface module is used by the digital monitor to show
its identification information to the video controller. It contains DDC1
hardware and a two-wire, bidirectional serial bus which is fully
compatible with multi-master IIC bus protocol to support DDC2AB
interface.
This module not only can be applied in internal communications, but can
also be used as a typical command reception serial bus for factory setup
and alignment purposes. It also provides the flexibility of hooking
additional devices to an existing system for future expansion without
adding extra hardware.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .196
Programming Considerations . . . . . . . . . . . . . . . . . . . . . . . . . 206
I/O Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
DDC Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
DDC Address Register (DADR) . . . . . . . . . . . . . . . . . . . . . 196
DDC2 Address Register (D2ADR) . . . . . . . . . . . . . . . . . . . 197
DDC Control Register (DCR) . . . . . . . . . . . . . . . . . . . . . . . 198
DDC Master Control Register (DMCR) . . . . . . . . . . . . . . . 199
DDC Status Register (DSR) . . . . . . . . . . . . . . . . . . . . . . . . 202
DDC Data Transmit Register (DDTR) . . . . . . . . . . . . . . . . 204
DDC Data Receive Register (DDRR) . . . . . . . . . . . . . . . . . 205
DDC12AB Interface
Section 15. DDC12AB Interface
Data Sheet
193